CN109161064B

CN109161064B - Low-heat-generation tire support rubber and preparation method and application thereof

Info

Publication number: CN109161064B
Application number: CN201811051990.6A
Authority: CN
Inventors: 林丛海
Original assignee: Zhaoqing Junhong Co Ltd
Current assignee: Zhaoqing Junhong Co Ltd
Priority date: 2018-09-10
Filing date: 2018-09-10
Publication date: 2021-03-19
Anticipated expiration: 2038-09-10
Also published as: CN109161064A

Abstract

The invention relates to a low-heat-generation tire support rubber and a preparation method and application thereof, belonging to the technical field of tire manufacturing. The support adhesive is prepared from the following raw materials in parts by weight: 5-50 parts of terminal modified solution polymerized styrene-butadiene rubber, 5-50 parts of natural rubber, 30-90 parts of rare earth butadiene rubber, 2-8 parts of zinc oxide, 2-5 parts of stearic acid, 1-5 parts of a life-prolonging agent, 2-5 parts of an anti-aging agent, 0.5-3 parts of protective wax, 1-5 parts of tackifying resin, 2-10 parts of hardening resin, 55-100 parts of carbon black, 10-35 parts of white carbon black, 0.5-3.5 parts of a silane coupling agent, 1-4 parts of sulfur and 2.3-8 parts of an accelerator. The support rubber has the effect of low heat generation, and is the preferred rubber material for preparing run-flat tires.

Description

Low-heat-generation tire support rubber and preparation method and application thereof

Technical Field

The invention relates to the technical field of tire manufacturing, in particular to low-heat-generation tire support rubber and a preparation method and application thereof.

Background

With the development of society and the acceleration of life rhythm, the requirements of people on driving safety, high speed, environmental protection and the like are gradually enhanced, the safety upgrading of the tire as the tire for the first life of automobile driving safety is very slow, and the tire with an explosion-proof function is popular with consumers.

In recent years, the products of the radial run-flat tires for foreign cars are gradually appeared on the market, and the safety upgrade of the tires is widely accepted.

The run-flat tire is a novel tire, which can still ensure the operability of a vehicle under the condition of complete air leakage in the running process, can run safely at the maximum speed of 80 kilometers per hour, and has the running distance of 80 kilometers, so that the daily driving of people becomes safer and more convenient. Meanwhile, the comfort and handling of run-flat tires under normal air pressure conditions are comparable to conventional tires. Along with the improvement of global environmental awareness, the automobile industry tends to light weight and miniaturization of vehicles more and more, and the run-flat tire can also help people to avoid the encumbrance and the redundant weight of the spare tire, so that the effects of saving oil and reducing emission are achieved.

We believe that this new type of tire, which is safe, convenient, comfortable and environmentally friendly, will be more and more accepted. However, the support rubber product which can be used as a run-flat tire at present is difficult to meet the requirements of people.

Disclosure of Invention

In view of the above, there is a need to provide a low heat generation tire support rubber, which has the effect of low heat generation and is the preferred rubber compound for preparing run-flat tires, and a preparation method and application thereof.

The low-heat-generation tire support rubber is prepared from the following raw materials in parts by weight:

repeated deformation of the tire has been found to cause hysteresis loss of the tire material and conversion to heat energy. Therefore, from the viewpoint of formulation, the run-flat tire should use a material having a low heat generation as much as possible, and should be considered with emphasis on a support rubber portion which does not easily dissipate heat. While the type and amount of carbon black has a greater effect on the heat generation of the compound, low heat generating carbon blacks should be used, but generally, low heat generating carbon blacks have poorer reinforcing properties.

On the basis, the inventor selects the low-heat-generation rare earth butadiene rubber through repeated experiments and screening, and can neutralize the heat generated by the carbon black to the rubber material. Therefore, the tire generates lower heat energy under repeated deformation, and is suitable for preparing a run-flat tire.

In one embodiment, the raw materials are as follows in parts by weight:

in one embodiment, the accelerator is composed of the following raw materials:

0.5-3 parts of accelerator NS

0.1 to 1.5 portions of accelerant DTDM

0.5-3.5 parts of accelerator TMTM

The above-mentioned accelerator NS (N-tert-butyl-2-benzothiazolesulfenamide) is preferably 2 to 3 parts, the accelerator DTDM (4, 4' -dithiodimorpholine) is preferably 0.5 to 1 part, and the accelerator TMTM (tetramethylthiuram monosulfide) is preferably 1.5 to 2.5 parts.

The carbon black consists of the following raw materials:

25-50 parts of N330 carbon black

20-50 parts of N660 carbon black.

The above-mentioned N330 carbon black is preferably 25 to 35 parts, and N660 carbon black is preferably 25 to 35 parts.

In one embodiment, the terminally modified solution-polymerized styrene-butadiene rubber is selected from: modified solution polymerized styrene-butadiene rubber of korean LG company model F1810.

In one embodiment, the tackifying resin is selected from: phenolic tackifying resins of the SP1068 type (sigroup, usa); the hardening resin is selected from: phenolic resin model SP6701 (sigroup, usa).

In one embodiment, the longevity agent is selected from: a shoulder-cavity-preventing rubber additive of cigarette-station Hongtada chemical company Limited;

the anti-aging agent is selected from: at least one of N-phenyl- α -aniline, N-phenyl-N '-isopropyl-p-phenylenediamine, N-N' -diphenyl-p-phenylenediamine, and p-phenylenediamine-based rubber antioxidant (antioxidant 4020);

the silane coupling agent is selected from: HP-669 type silane coupling agent available from Jingdezhen Hongbai chemical science and technology, Inc.;

the sulfur is selected from: insoluble sulfur with the sulfur content of more than or equal to 95 percent. The sulfur has good fluidity in rubber mixing, high dispersibility and difficult blooming of rubber materials.

In one embodiment, the density of the supporting rubber is 0.989-1.189kg/dm³。

The invention also discloses a preparation method of the low-heat-generation tire support rubber, which comprises the following steps:

mixing: weighing the raw materials according to the formula, and stirring and mixing at a preset pressure and temperature;

extruding: extruding the materials obtained by mixing by a double-screw extruder, tabletting, passing through an isolation solution, cooling and stacking to obtain the composite material.

In one embodiment, in the mixing step, the pressure is 45-55N/cm²Mixing at 150-180 deg.c and 40-50rm for 150-180 sec;

in the extruding step, the spacer fluid mainly comprises: stearic acid soap and talc.

The invention also discloses application of the low-heat-generation tire support rubber in preparing a run-flat tire.

Compared with the prior art, the invention has the following beneficial effects:

the low-heat-generation tire support rubber disclosed by the invention is obtained by screening and adjusting a raw material formula, particularly by groping the dosage of the rare earth butadiene rubber, and the problems of flexibility resistance and compression heat generation of the support rubber can be obviously improved by 30-90 parts of the rare earth butadiene rubber. The formula of the low-heat-generation tire support rubber has good plasticity in the rubber processing process, is good in compatibility with rubber, is beneficial to uniform dispersion of resin and filler in rubber, improves the rubber extrusion process condition and rubber flowability, and has smooth and flat extrusion surface, good viscosity and difficulty in rubber burning.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The starting materials used in the following examples are all commercially available.

Example 1

The low-heat-generation tire support rubber comprises the following components in parts by weight:

the low-heat-generation tire support rubber is prepared by the following method:

1. mixing:

(1) and (5) preparing materials.

Raw materials are put into a factory for inspection, and are dried and cut according to the requirements or directly fed according to the formula amount and automatically weighed.

(2) Automatic mixing of an internal mixer:

the raw materials are put in an internal mixer at a pressure of 50N/cm²Kneading at 165 ℃ and 45rmp for 165 seconds, and then discharging the rubber.

2. Double-screw extrusion and tabletting:

extruding with twin screw, tabletting, passing through isolating liquid (mainly comprising stearic acid soap and pulvis Talci), cooling, and stacking.

Example 2

the low heat generation tire support rubber is prepared according to the method of example 1.

Example 3

Example 4

Example 5

Example 6

Comparative example 1

The tire support rubber has the following formula (in parts by weight):

the above tire support rubber was prepared according to the method of example 1.

Comparative example 2

The tire support rubber has the following formula (in parts by weight):

Comparative example 3

The supporting adhesive comprises the following components in parts by weight:

Comparative example 4

Comparative example 5

Examples of the experiments

The support adhesive prepared in the above examples and comparative examples was subjected to a performance test.

The test requirements are as follows:

high speed experiments were performed on the finished tires: the test was carried out at 80km/h under zero air pressure for 80km, and the internal temperature of the tire, the temperature of the support rubber portion, the amount of tire subsidence, the appearance of the tire at the end of the test, and the like were measured, and the results are shown in the following table.

TABLE 1 indoor high-speed Performance test results of finished tires

From the above results, it can be seen that the tire internal temperature, the support rubber site temperature and the tire sinkage data obtained with the support rubbers of examples 1 and 5 are smaller than those of comparative examples 1 to 5, indicating that the tires of examples 1 and 5 are comparatively low in yield resistance and heat generation, while the tires of comparative examples are poor in yield resistance and large in heat generation. And example 5 has the best low heat generation effect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The low-heat-generation tire support rubber is characterized by being prepared from the following raw materials in parts by weight:

or

The health-care food is prepared from the following raw materials in parts by weight:

2. the method for preparing a low heat generation tire support rubber according to claim 1, characterized by comprising the following steps:

3. The method for producing a low-heat-generation tire support according to claim 2,

in the mixing step, the pressure is 45-55N/cm²Mixing at 150-180 deg.c and 40-50rm for 150-180 sec;

4. Use of the low heat generation tire support rubber of claim 1 in the preparation of run-flat tires.